Restore ppc64 CI job and remove the travis_wait that caused the problem with it

.travis.yml

@@ -17,7 +17,7 @@ matrix:
         - COMMON_FLAGS="DYNAMIC_ARCH=1 TARGET=NEHALEM NUM_THREADS=32"
       script:
         - set -e
-        - travis_wait 45 make QUIET_MAKE=1 $COMMON_FLAGS $BTYPE
+        - make QUIET_MAKE=1 $COMMON_FLAGS $BTYPE
         - make -C test $COMMON_FLAGS $BTYPE
         - make -C ctest $COMMON_FLAGS $BTYPE
         - make -C utest $COMMON_FLAGS $BTYPE
@@ -25,14 +25,14 @@ matrix:
         - TARGET_BOX=LINUX64
         - BTYPE="BINARY=64"
 
-        #    - <<: *test-ubuntu
-        #      os: linux-ppc64le
-        #      before_script:
-        #        - COMMON_FLAGS="DYNAMIC_ARCH=1 TARGET=POWER8 NUM_THREADS=32"
-        #      env:
-        #        # for matrix annotation only
-        #        - TARGET_BOX=PPC64LE_LINUX
-        #        - BTYPE="BINARY=64 USE_OPENMP=1"
+    - <<: *test-ubuntu
+      os: linux-ppc64le
+      before_script:
+        - COMMON_FLAGS="DYNAMIC_ARCH=1 TARGET=POWER8 NUM_THREADS=32"
+      env:
+        # for matrix annotation only
+        - TARGET_BOX=PPC64LE_LINUX
+        - BTYPE="BINARY=64 USE_OPENMP=1"
 
     - <<: *test-ubuntu
       env: